Fix health bar renderer

[Alexdoru]

Tinkers constructs completely overwrites the health bar rendering and there were multiple bugs with it. Notably it was drawing all of the hearts that your character has on top of each other even though you can only see the 10 hearts at the very top, costing performance for nothing.

In this pr I :

• add some code that has been forgotten when copying and overriding the vanilla renderHealth method
• create dedicated class HealthBarRenderer extending Gui to stop copy-pasting certain vanilla methods
• fix renegeration hearts moving when the game is paused
• only bind tinkers hearts textures if it's actually going to draw tinkers' hearts (helth above 20)
• stop drawing vanilla hearts when they are hidden by tinkers' heart being drawn on top
• fix tinker's half heart not moving with regeneration
• fix drawing all tinkers' hearts on top of each others, and now only draw the top most hearts

[Dream-Master]

@Alexdoru are you know that we have overloaded bar as a mod which seems to override stuff as well ?

[Alexdoru]

I did not know, where is that ?

[Dream-Master]

@Alexdoru nevermind it was the Armor bar not the health bar. https://github.com/GTNewHorizons/OverloadedArmorBar