Sort lines in assets.txt

[henu]

First of all, sorry if this PR is crappy, I just made it very quickly while being tired in hopes it will help the LibGDX project.

I noticed adding .sort() fixed a really annoying problem of assets/assets.txt constantly changing order of lines if the project was developed on different machines.

[SonicGDX]

Might be worth updating the comment too to mention the sort, but depends if @tommyettinger thinks that is necessary

[tommyettinger]

I think I'll merge this regardless, but do you think users would prefer a case-insensitive sort (as provided in Java by String.CASE_INSENSITIVE_ORDER)? I found it a bit more readable to have:

.gitkeep
A-Starry-License.txt
A-Starry.ttf
AStarry-standard.fnt
AStarry-standard.png
Bitter-License.txt
Bitter-standard.fnt
Bitter-standard.png
font_main.ttf
Gentium-License.txt
Gentium-Un-Italic-standard.dat
Gentium-Un-Italic-standard.png
Gentium-Un-Italic.ttf
GentiumUnItalic-standard.fnt
GentiumUnItalic-standard.png
Inconsolata-LGC-License.txt
Inconsolata-LGC.ttf
Open-Sans-License.txt
uiskin.png
uiskin2.atlas
uiskin2.json

Instead of what I had with just sort(),

.gitkeep
A-Starry-License.txt
A-Starry.ttf
AStarry-standard.fnt
AStarry-standard.png
Bitter-License.txt
Bitter-standard.fnt
Bitter-standard.png
Gentium-License.txt
Gentium-Un-Italic-standard.dat
Gentium-Un-Italic-standard.png
Gentium-Un-Italic.ttf
GentiumUnItalic-standard.fnt
GentiumUnItalic-standard.png
Inconsolata-LGC-License.txt
Inconsolata-LGC.ttf
Open-Sans-License.txt
font_main.ttf
uiskin.png
uiskin2.atlas
uiskin2.json

The only change I made was from sort() to sort(true, String.CASE_INSENSITIVE_ORDER) . Jumping from Open-Sans to font_main surprised me a bit, so I feel like the case-insensitive sort might help. It's a quick thing I can add on top of this PR, though, so I'll merge now and maybe add the case-insensitive comparator later.

[tommyettinger]

Oh, the case-insensitive sort might mess with ordering if any file prefixes are exactly the same in name other than case. But, that game might not even work at all if building on Windows, due to the case-insensitive file system... I think I'll leave it as-is for now.