File Management, Single Launch fix, minor bug fixes, major refactoring

Leikr 0.0.7 brings an all new file management system (removed all the manual new File() calls and replaced them with the proper Gdx.files.local() calls. Much cleaner)

Single Launch was fixed, allowing single launch titles to work! As you can see Here:

This release also comes with an experimental JRE bundled (thanks to AdoptOpenJDK 12 with hotspot)
The Linux executable will default to this if it exists, The windows .bat file will need to be edited to look for it.

Much of the internal structure was redesigned to use less resources (in prep for Arm builds for the raspberry pi). This is a good thing, as the system now takes far less resources, but runs exactly the same on Desktop/Laptop and much better on Raspberry Pi.