Add trace logging to debugCallback if needed for development

Improve deadzone algorithm and use it for SDL_GameController, fix #111

doc: Add transparent white circle to logo so that it looks better wit…

…h a dark background

jngl-test: Use newer drawTriangle function

Add jngl::Mat3::scale(float, float)

Bump version to 1.4.1

Bump version number to 1.4.0

Meson: Generate and install pkg-config file, see #7

Include xinput.h with lower-case X for cross-compilation

Version 1.2.0