1.8.9 update and gradle tweaks

[Lunatrius]

Update .git* files
Update gradle script and wrapper
Replace version checking with Forge version checking
Remove deprecated/unused classes

This PR is also a prerequisite for:

• 1.8.9 update bspkrs/ArmorStatusHUD#11
• 1.8.9 update bspkrs/CrystalWing#12
• 1.8.9 update bspkrs/DirectionHUD#3
• 1.8.9 update bspkrs/FloatingRuins#5
• 1.8.9 update bspkrs/StartingInventory#12
• 1.8.9 update bspkrs/StatusEffectHUD#8
• 1.8.9 update bspkrs/Treecapitator#39
• 1.8.9 update WorldStateCheckpoints#14

Some of the common changes:

• .git* files: should make sure line endings are the same for everyone editing the code, organized the ignore list a bit
• build.gradle:
  • config -> project: gradle automagically reads the properties from gradle.properties into the properties object
  • updated ForgeGradle, added CurseGradle
    • api_key_curse: defined in the global gradle properties file (usually ~/.gradle/gradle.properties)
    • extra_curse_id and extra_curse_releasetype: defined in the project's gradle.properties, release type is optional
• all mods use Forge's version checking system - the URLs point to http://bspk.rs/Minecraft/<modid>.json

Version file format:

{
    "homepage": "http://whatever.com/",
    "promos": {
        "1.8.9-latest": "8.7",
        "1.8.9-recommended": "8.6.1"
    },
    // change logs, entirely optional
    "1.8.9": {
        "8.3": "update thing",
        "8.3.1": "update that",
        "8.4": "update this",
        "8.5": "remove that",
        "8.6": "add that\nadd something",
        "8.6.1": "remove something",
        "8.7": "change that"
    }
}

[BlueAnanas]

Just to make sure that you're aware that I shamelessly used your PR in my Update 1.9 #29

BTW, I use following patch on my Jenkins project to get the bspkrsCore dependency working in DirectionHUD and other mods relying on it

sed -i '
/deobfCompile/ c\
    deobfCompile group: '\''bspkrs'\'', name: '\''bspkrscore'\'', version: project.bscore_version
' build.gradle
sed -i '
/ivy / {N;N;N;N;N;c\
    maven {\
        name = '\''zebra'\''\
        url = '\''https://nexus.3zebras.eu/repository/maven-releases'\''
}' build.gradle