* Disabling WindowSizeCallback around fullscreen toggle.
#1294 fixed the issue that toggle fullscreen changes the screen size because of the WindowSizeCallback. The proposed edit by @raysan5 was to comment out WindowSizeCallback which I essentially simplified to disable the callback around the set window monitor functions.
The developers using the ToggleFullscreen function should be aware that they need to size the screen correctly on that same frame. Otherwise they should check if fullscreen and size properly using the GetMonitorWidth and GetMonitorHeight functions.
* Update core.c
Fix issue from merge
This solves issue #1322 which in my opinion was prematurely closed. As the monitor resolution is expected to be the maximum that the monitor supports. My change is that as per GLFW documentation you can get all current video modes sorted by max resolution. When you toggle fullscreen the first video mode returned would be the current screen resolution setup but that doesn't help if you want to know the maximum supported.
* Added a new utility function to get the current monitor.
Some of the other functions rely on passing on a monitor id but we only have a function for querying the count of monitors available.
* Updated the comment to correctly reflect the function action
This monitor should even probably be passed as an id instead to make it more consistent with the rest of the API but this would break existing applications so I am hesitant to change the function signature directly.
Pefixing/Suffixing some data type identifier in the variables is not a convention used in raylib, just reviewed it for consistency...
Still, I kept the *Rec suffix in some functions.
Previous GetKeyPressed() method was actually returning unicode codepoints equivalent values instead of the key-code of the pressed key. So, it has been replaced by GetCharPressed(), returning unicode codepoints and GetKeyPressed() now returns key-codes.
* Fixed the build for web using CMake.
I found that the build for me was failing and I added some if defined checks in the core.c file where the glfwSetWindowAttrib was used. (error: implicit declaration of function 'glfwSetWindowAttrib' is invalid in C99 [-Werror,-Wimplicit-function-declaration])
I also changed some values in the toolchain file so that it correctly uses the .bat files when on windows.
* Cleaned up the additional variables (they are not important)
* Added more improvements to cmakelists
Added the option to use the system provided Emscripten toolchain to be more uniform with other libraries.
Fixed and issue which prevented example being built from cmake and also building with html extensions properly.
* Fixed ENUM to STRING because of a missed warning
WARNING: Several functions removed, replaced by SetWindowState() / ClearWindowState() equivalents, only for advance users.
ADDED: ClearWindowState() to reset window state
REMOVED: HideWindow() / UnhideWindow()
REMOVED: DecorateWindow() / UndecorateWindow()
