Game settings screen, and minor fix on discordRPC

- Uses BG previously from the input config screen, which has gotten a new BG
- Minor tweak on the input config screen to display all inputs names regardless of if they are bound or not
- Added Mod1 function to `funcs.lua`, may be useful again sometime
- Added game settings
  * Manual locking (per gamemode, per ruleset, on harddrop or on softdrop)
  * Piece colours (per ruleset, TTC or Arika)
  * World Reverse toggle
- Moved the discordRPC `libs/` directory, as it's a third party library
- Edited the `discordRPC.lua` file to look for the dll at the right place regardless of how you run the game (until we fuse it that is)

This should have probably been done in several commits, sorry about that

tetris/modes/gamemode.lua

@@ -43,6 +43,8 @@ function GameMode:new()
 	-- variables related to configurable parameters
 	self.drop_locked = false
 	self.hard_drop_locked = false
+    self.lock_on_soft_drop = false
+    self.lock_on_hard_drop = false
 	self.hold_queue = nil
 	self.held = false
 	self.section_start_time = 0
@@ -59,6 +61,7 @@ function GameMode:getLineClearDelay() return 40 end
 function GameMode:getDasLimit() return 15 end
 
 function GameMode:getNextPiece(ruleset)
+    
 	return {
 		skin = "2tie",
 		shape = self.randomizer:nextPiece(),
@@ -72,6 +75,8 @@ function GameMode:initialize(ruleset)
 	for i = 1, self.next_queue_length do
 		table.insert(self.next_queue, self:getNextPiece(ruleset))
 	end
+    self.lock_on_soft_drop = ({self.instant_soft_drop, ruleset.softdrop_lock, false, true })[config.gamesettings.manlock]
+    self.lock_on_hard_drop = ({self.instant_hard_drop, ruleset.harddrop_lock, true,  false})[config.gamesettings.manlock]
 end
 
 function GameMode:update(inputs, ruleset)
@@ -125,7 +130,7 @@ function GameMode:update(inputs, ruleset)
 			self.piece:isDropBlocked(self.grid) and
 			not self.hard_drop_locked then
 			self:onHardDrop(piece_dy)
-			if self.instant_hard_drop then
+			if self.lock_on_hard_drop then
 				self.piece.locked = true
 			end
 		end
@@ -134,7 +139,7 @@ function GameMode:update(inputs, ruleset)
 			self:onSoftDrop(piece_dy)
 			if self.piece:isDropBlocked(self.grid) and
 				not self.drop_locked and
-				self.instant_soft_drop
+				self.lock_on_soft_drop
 			then
 				self.piece.locked = true
 			end
@@ -340,11 +345,12 @@ function GameMode:drawGhostPiece(ruleset)
 end
 
 function GameMode:drawNextQueue(ruleset)
+    local colourscheme = ({ruleset.colourscheme, ColourSchemes.Arika, ColourSchemes.TTC})[config.gamesettings.piece_colour]
 	function drawPiece(piece, skin, offsets, pos_x, pos_y)
 		for index, offset in pairs(offsets) do
 			local x = offset.x + ruleset.spawn_positions[piece].x
 			local y = offset.y + 4.7
-			love.graphics.draw(blocks[skin][piece], pos_x+x*16, pos_y+y*16)
+			love.graphics.draw(blocks[skin][colourscheme[piece]], pos_x+x*16, pos_y+y*16)
 		end
 	end
 	for i = 1, self.next_queue_length do