Enable Compatibility with Windows (#2333)

## Issue Addressed

Windows incompatibility.

## Proposed Changes

On windows, lighthouse needs to default to STDIN as tty doesn't exist. Also Windows uses ACLs for file permissions. So to mirror chmod 600, we will remove every entry in a file's ACL and add only a single SID that is an alias for the file owner.

Beyond that, there were several changes made to different unit tests because windows has slightly different error messages as well as frustrating nuances around killing a process :/

## Additional Info

Tested on my Windows VM and it appears to work, also compiled & tested on Linux with these changes. Permissions look correct on both platforms now. Just waiting for my validator to activate on Prater so I can test running full validator client on windows.

Co-authored-by: ethDreamer <37123614+ethDreamer@users.noreply.github.com>
Co-authored-by: Michael Sproul <micsproul@gmail.com>

book/src/installation-source.md

@@ -1,9 +1,10 @@
 # Installation: Build from Source
 
-Lighthouse builds on Linux, macOS, and Windows (via [WSL][] only).
+Lighthouse builds on Linux, macOS, and Windows (native Windows support in
+BETA, we also support Windows via [WSL][]).
 
-Compilation should be easy. In fact, if you already have Rust installed all you
-need is:
+Compilation should be easy. In fact, if you already have Rust and the build
+dependencies installed, all you need is:
 
 - `git clone https://github.com/sigp/lighthouse.git`
 - `cd lighthouse`
@@ -26,35 +27,43 @@ directory will be the location you cloned Lighthouse to during the installation
 - `git checkout ${VERSION}`
 - `make`
 
+
 ## Detailed Instructions
 
-1. Install Rust and Cargo with [rustup](https://rustup.rs/).
-    - Use the `stable` toolchain (it's the default).
-	- Check the [Troubleshooting](#troubleshooting) section for additional
-		dependencies (e.g., `cmake`).
+1. Install the build dependencies for your platform
+	- Check the [Dependencies](#dependencies) section for additional
+		information.
 1. Clone the Lighthouse repository.
     - Run `$ git clone https://github.com/sigp/lighthouse.git`
     - Change into the newly created directory with `$ cd lighthouse`
 1. Build Lighthouse with `$ make`.
-1. Installation was successful if `$ lighthouse --help` displays the
-   command-line documentation.
+1. Installation was successful if `$ lighthouse --help` displays the command-line documentation.
 
 > First time compilation may take several minutes. If you experience any
 > failures, please reach out on [discord](https://discord.gg/cyAszAh) or
 > [create an issue](https://github.com/sigp/lighthouse/issues/new).
 
-## Windows Support
 
-Compiling or running Lighthouse natively on Windows is not currently supported. However,
-Lighthouse can run successfully under the [Windows Subsystem for Linux (WSL)][WSL]. If using
-Ubuntu under WSL, you can should install the Ubuntu dependencies listed in the [Dependencies
-(Ubuntu)](#dependencies-ubuntu) section.
+## Dependencies
+
+#### Installing Rust
+
+The best way to install Rust (regardless of platform) is usually with [rustup](https://rustup.rs/)
+- Use the `stable` toolchain (it's the default).
+
+#### Windows Support
+
+These instructions are for compiling or running Lighthouse natively on Windows, which is currently in
+BETA testing. Lighthouse can also run successfully under the [Windows Subsystem for Linux (WSL)][WSL].
+If using Ubuntu under WSL, you should follow the instructions for Ubuntu listed in the
+[Dependencies (Ubuntu)](#ubuntu) section.
 
 [WSL]: https://docs.microsoft.com/en-us/windows/wsl/about
 
-## Troubleshooting
-
-### Dependencies
+1. Install [Git](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git)
+1. Install [Chocolatey](https://chocolatey.org/install) Package Manager for Windows
+    - Install `make` via `choco install make`
+    - Install `cmake` via `choco install cmake --installargs 'ADD_CMAKE_TO_PATH=System'`
 
 #### Ubuntu
 
@@ -71,6 +80,9 @@ You will need `cmake`. You can install via homebrew:
 
     brew install cmake
 
+
+## Troubleshooting
+
 ### Command is not found
 
 Lighthouse will be installed to `CARGO_HOME` or `$HOME/.cargo`. This directory

book/src/slasher.md

@@ -12,6 +12,7 @@ of the immaturity of the slasher UX and the extra resources required.
 * Quad-core CPU
 * 16 GB RAM
 * 256 GB solid state storage (in addition to space for the beacon node DB)
+* ⚠️ **If you are running natively on Windows**: LMDB will pre-allocate the entire 256 GB for the slasher database
 
 ## How to Run