* Update Steam path detection for Linux
As Steam now uses Proton to install Windows version natively, update
paths so they get found automatically
* Use new Steam path detection on Linux only
This restores Steam path detection on macOS as it doesn't have Proton
https://github.com/OpenRCT2/OpenRCT2/pull/20502 changed how startup is
handled. This affected Android as well and changed AndroidClassLoader to
be initialized statically, but this turns out to be problematic due to
JVM not being fully initialized in our context by this time.
To fix this, move AndroidClassLoader initialization to JNI_OnLoad call,
where JVM is fully available.
Additionally, guard against multiple calls to JNI_OnLoad, an issue
present on Linux-like systems (including Android).
Clang-format sees the text behind `#pragma region` as code and formats it. Instead of stating the copyright and date there, it's now in the comment block right below it. The text "Copyright" is left in the `#pragma region` line, as clang-format sees it as a single identifier.
I took the opportunity to normalize the dates, and add the copyright notice to the source files where it was missing them (except for third-party and the generated resources.h file).
