Fix Gui.cpp merge and enhance hardcore mode visuals

This commit adds new `NamedFrame` entries and `KeyFrame` animations in `skin_Minecraft.xui` for various hardcore game modes, improving the UI representation (likely will get rid of this since it's dead code). A new `isHardcore` variable in `XUI_HUD.cpp` allows for conditional health icon animations based on the game mode. Additionally, commented-out code in `Gui.cpp` has been removed to streamline rendering logic. Several new PNG images for health states in hardcore mode have also been added to enhance the user experience.

TL;DR: This commit is basically just prep for adding hardcore heathbar hearts while also fixing some breaking that occurred in Gui.cpp after a merge.

Minecraft.Client/Common/Media/skin_Minecraft.xui

@@ -38220,6 +38220,56 @@
 <Time>19</Time>
 <Command>stop</Command>
 </NamedFrame>
+<NamedFrame>
+<Name>NormalHardcore</Name>
+<Time>20</Time>
+<Command>stop</Command>
+</NamedFrame>
+<NamedFrame>
+<Name>HalfHardcore</Name>
+<Time>21</Time>
+<Command>stop</Command>
+</NamedFrame>
+<NamedFrame>
+<Name>FullHardcore</Name>
+<Time>22</Time>
+<Command>stop</Command>
+</NamedFrame>
+<NamedFrame>
+<Name>HalfPoisonHardcore</Name>
+<Time>23</Time>
+<Command>stop</Command>
+</NamedFrame>
+<NamedFrame>
+<Name>FullPoisonHardcore</Name>
+<Time>24</Time>
+<Command>stop</Command>
+</NamedFrame>
+<NamedFrame>
+<Name>NormalFlashHardcore</Name>
+<Time>25</Time>
+<Command>stop</Command>
+</NamedFrame>
+<NamedFrame>
+<Name>HalfFlashHardcore</Name>
+<Time>26</Time>
+<Command>stop</Command>
+</NamedFrame>
+<NamedFrame>
+<Name>FullFlashHardcore</Name>
+<Time>27</Time>
+<Command>stop</Command>
+</NamedFrame>
+<NamedFrame>
+<Name>HalfPoisonFlashHardcore</Name>
+<Time>28</Time>
+<Command>stop</Command>
+</NamedFrame>
+<NamedFrame>
+<Name>FullPoisonFlashHardcore</Name>
+<Time>29</Time>
+<Command>stop</Command>
+</NamedFrame>
 </NamedFrames>
 <Timeline>
 <Id>Border</Id>
@@ -38274,6 +38324,16 @@
 <Interpolation>0</Interpolation>
 <Prop>Graphics\HUD\Health_Background_Flash.png</Prop>
 </KeyFrame>
+<KeyFrame>
+<Time>20</Time>
+<Interpolation>0</Interpolation>
+<Prop>Graphics\HUD\Health_Background_Hardcore.png</Prop>
+</KeyFrame>
+<KeyFrame>
+<Time>25</Time>
+<Interpolation>0</Interpolation>
+<Prop>Graphics\HUD\Health_Background_Hardcore_Flash.png</Prop>
+</KeyFrame>
 </Timeline>
 <Timeline>
 <Id>Heart</Id>
@@ -38399,6 +38459,66 @@
 <Prop>true</Prop>
 <Prop>Graphics\HUD\HorseHealth_Half_Flash.png</Prop>
 </KeyFrame>
+<KeyFrame>
+<Time>20</Time>
+<Interpolation>0</Interpolation>
+<Prop>false</Prop>
+<Prop></Prop>
+</KeyFrame>
+<KeyFrame>
+<Time>21</Time>
+<Interpolation>0</Interpolation>
+<Prop>true</Prop>
+<Prop>Graphics\HUD\Health_Half_Hardcore.png</Prop>
+</KeyFrame>
+<KeyFrame>
+<Time>22</Time>
+<Interpolation>0</Interpolation>
+<Prop>true</Prop>
+<Prop>Graphics\HUD\Health_Full_Hardcore.png</Prop>
+</KeyFrame>
+<KeyFrame>
+<Time>23</Time>
+<Interpolation>0</Interpolation>
+<Prop>true</Prop>
+<Prop>Graphics\HUD\Health_Half_Poison_Hardcore.png</Prop>
+</KeyFrame>
+<KeyFrame>
+<Time>24</Time>
+<Interpolation>0</Interpolation>
+<Prop>true</Prop>
+<Prop>Graphics\HUD\Health_Full_Poison_Hardcore.png</Prop>
+</KeyFrame>
+<KeyFrame>
+<Time>25</Time>
+<Interpolation>0</Interpolation>
+<Prop>false</Prop>
+<Prop></Prop>
+</KeyFrame>
+<KeyFrame>
+<Time>26</Time>
+<Interpolation>0</Interpolation>
+<Prop>true</Prop>
+<Prop>Graphics\HUD\Health_Half_Flash_Hardcore.png</Prop>
+</KeyFrame>
+<KeyFrame>
+<Time>27</Time>
+<Interpolation>0</Interpolation>
+<Prop>true</Prop>
+<Prop>Graphics\HUD\Health_Full_Flash_Hardcore.png</Prop>
+</KeyFrame>
+<KeyFrame>
+<Time>28</Time>
+<Interpolation>0</Interpolation>
+<Prop>true</Prop>
+<Prop>Graphics\HUD\Health_Half_Poison_Flash_Hardcore.png</Prop>
+</KeyFrame>
+<KeyFrame>
+<Time>29</Time>
+<Interpolation>0</Interpolation>
+<Prop>true</Prop>
+<Prop>Graphics\HUD\Health_Full_Poison_Flash_Hardcore.png</Prop>
+</KeyFrame>
 </Timeline>
 </Timelines>
 </XuiVisual>