移除Zframework，准备使用submodule

Zframework/background.lua

@@ -1,56 +0,0 @@
-local gc_clear=love.graphics.clear
-local BGs={
-    none={draw=function()gc_clear(.08,.08,.084)end}
-}
-local BGlist={'none'}
-local BG={
-    default='none',
-    locked=false,
-    cur='none',
-    init=false,
-    resize=false,
-    update=NULL,
-    draw=BGs.none.draw,
-    event=false,
-    discard=NULL,
-}
-
-function BG.lock()BG.locked=true end
-function BG.unlock()BG.locked=false end
-function BG.add(name,bg)
-    BGs[name]=bg
-    BGlist[#BGlist+1]=name
-end
-function BG.getList()
-    return BGlist
-end
-function BG.remList(name)
-    table.remove(BGlist,TABLE.find(BGlist,name))
-end
-function BG.send(...)
-    if BG.event then
-        BG.event(...)
-    end
-end
-function BG.setDefault(bg)
-    BG.default=bg
-end
-function BG.set(name)
-    name=name or BG.default
-    if not BGs[name]or BG.locked then return end
-    if name~=BG.cur then
-        BG.discard()
-        BG.cur=name
-        local bg=BGs[name]
-
-        BG.init=   bg.init or NULL
-        BG.resize= bg.resize or NULL
-        BG.update= bg.update or NULL
-        BG.draw=   bg.draw or NULL
-        BG.event=  bg.event or NULL
-        BG.discard=bg.discard or NULL
-        BG.init()
-    end
-    return true
-end
-return BG