Add CMake build system and new features

[joneqdaniel]

• add CMakeLists.txt and remove existing Makefile/install.sh
• separate headers to include/
• fix [bug][example] 06_basic_text crashes with optimization level > 1 #2
• update README.md with CMake instructions and syntax highlighting
• add .gitignore allowing in-source tree build commits
• add standard includes to fgl.h
• use exit(EXIT_SUCCESS) instead of return 0 in main
• add FGL_ALIGN and use it for vector types
• add vec2i, vec3i, vec4i, vec3d, vec4d
• add fgl_update_window()
• add fgl_is_window_resized()
• add fgl_get_window_size()
• add fgl_sysconfig_string()
• add fgl_time_string()
• add fgl_window_flip_vsync()
• add fgl_window_frames()
• add fgl_window_fps()
• add fgl_window_fps_string()
• add fgl_timer
• update printf format message output style to [FGL][type] [section][subsection]
• update examples with enable/disable vsync and resolution resize sync