Update Windows build instructions & contributing docs

[GongBingWong]

Description

Based on my experience as a first time contributor, I added what I thought would be useful to know for other first time contributors.

I updated the 'BUILDING_ON_WINDOWS.md' file to include more steps for Qt, included how to add to PATH for Qt and conan 2, and added 'cd ..' as a step to build.

I updated the 'CONTRIBUTING.md' file (not really sure where to put general non-code related contribution info) to include what I learned with my contribution (the need to create a specific branch instead of using main, and also to update the 'CHANGELOG.md' file).

[Felanbird]

Suggested change

	<details>
	<summary>How to add conan 2 to PATH</summary>
	1. Type "path" in the start menu and click on the "Edit the system environment variables" result that shows up (this should open up the 'System Properties' window with the 'Advanced' tab selected).
	2. Press on the "Environment Variables..." button near the bottom right of the 'System Properties' window to open up the 'Environment Variables' window.
	3. Within 'Environment Variables', look at the bottom half of the window where it lists 'System variables' and double click on the variable named 'Path' to open up the 'Edit environment variable' window.
	4. Press the 'New' button near the top right to create a new environment variable.
	5. Open up your terminal with the Visual Studio environment variables (e.g. `x64 Native Tools Command Prompt for VS 2022`) and type "where conan" to find the file path (the folder that contains the conan.exe) to add.
	6. Add conan 2's file path (e.g. `C:\Users\willg\AppData\Roaming\Python\Python311\Scripts`) to the blank text box that shows up.
	7. Press the "OK" button.
	</details>

As noted by the instruction above, the default settings automatically setup PATH to recognize conan.

[GongBingWong]

Yeah, you're right. I didn't even notice the "default setting". xD

Also do you know if the 'where conan' command only works if conan 2 is in PATH?

If so, maybe it could be used to verify conan 2 is in PATH.

[Felanbird]

While it is true the changelog check will cry without a changelog, I don't think first time contributors should feel like they need to come up with a changelog entry, where applicable we'll just write one for you if one isn't included.

[GongBingWong]

Ah okay, should that info be mentioned then?

[pajlada]

I'd say just omit the changelog stuff, the branch thing is handy

[GongBingWong]

Ok.

[Nerixyz]

This adds python's scripts to PATH. Maybe this should read something like "Installing with pip" and include the pip install. Furthermore, I thought default python installations would add themselves to PATH by default.

[GongBingWong]

Yeah, maybe its pip specific. I don't know if default python installations add themselves to PATH by default, I think I manually added conan 2 to PATH (don't remember if it was there before).

I'm probably just going to commit Felanbird's suggestion to remove it after I ask about something.

The reason I haven't committed it yet because I'm not sure if I should resolve a conversation (by doing a commit) when I still have a question about a related topic.

[pajlada]

I'd say just omit the changelog stuff, the branch thing is handy

[Nerixyz]

I know this is a bit late, but Qt 6.6.0 will be out tomorrow (most likely), and we noticed a bug in Qt 6.5.3 [not in 6.6], so I think it would be better to use 6.6.0 here, but it's not that big of a deal.

[pajlada]

I'm ok with this not being the absolute latest or correct version since it's an example - as long as it's Qt 6 it'll be close enough

[Nerixyz]

When reading the entire file, I noticed that we're saying Qt 5.12 and up are supported, even though on Windows, we're only supporting Qt 5.15 and up (technically 5.12 should still compile though).

• Installing the latest stable Qt version is advised for new installations, but if you want to use your existing installation please ensure you are running Qt 5.12 or later.