NOTE: This functionality has an important issue, line space is fixed to 1.5 font.baseSize pixels, depending on the font and how it has been generated that spacing could be too wide or too narrow...

In `InitGraphicsDevice(...)`, the Android section has a screen security check
like other platforms- but CORE.display.width, CORE.display.height are
not set yet, so the security check sets it to 0. So ensure we query the
device's screen width and height before the screen size security check.

This also gives you the ability to run a proper full-screen application
on Android without any scaling and guess work on the target device by
setting screen width and height to 0 in `InitWindow(...)` and using
`GetScreen[Width|Height]()` to get the actual values.

Improved file access checks

Very weird... lately icons are not properly displayed on browser!

After several reviews, now it seems everything works as expected.

* Update raymath.h

Added Vector2Rotate Function.

* Update raymath.h

IsMouseButtonDown() does not process touch state down properly, state is reseted every frame...

Guarantee string is zero-terminated

Use new file I/O ABI

Use new file I/O ABI

Using new file I/O ABI

Using new file I/O ABI

Using new file I/O ABI

Using new file I/O ABI

Renamed functions for consistency:

 - StorageLoadValue() > LoadStorageValue()
 - StorageSaveValue() > SaveStorageValue()