Compatible with Haxe 4.0.0-rc3+

Major changes:

• [WIP] JIT hot reloading with hl --hot-reload
• Display local functions in stacks based on their parent method (ClassName.foo~2 for example)
• Review allocation tracking API, added dynamic accesses tracking
• SDL/DX : added compressed textures support
• hashlink post-compilation library : added ability to generate VisualStudio solution with -D hlgen.makefile=vs2015 (see templates here)
• added HSTRUCT support (Haxe @:struct class Foo {}) to have a 1:1 mapping with C structure (still a pointer)
• some Unicode fixes
• fmt : added dxt decode
• sdl : added joystick API (@josuigoa)
• sdl/dx : added scancodes (@Yanrishatum)

Full Changes 1.9...1.10