添加halloween主题，包括一个bgm，一个按钮主题，主菜单打雷特效，带蜘蛛网的标题和一个南瓜

close #757

parts/theme.lua

@@ -4,6 +4,7 @@ local THEME={
 local themeColor={
     xmas={COLOR.lR,COLOR.Z,COLOR.lG},
     sprfes={COLOR.lR,COLOR.O,COLOR.lY},
+    halloween={COLOR.lH,COLOR.O,{COLOR.hsv(0.76, 0.50, 0.42)},{COLOR.hsv(0.33, 0.80, 0.42)}},
 }
 
 function THEME.calculate(Y,M,D)
@@ -16,6 +17,10 @@ function THEME.calculate(Y,M,D)
         M=='12' and math.abs(D-25)<4 and
         'xmas' or
 
+        -- Halloween
+        (M=='11' and D>='28' or M=='12' and D<='04') and
+        'halloween' or
+
         -- Birthday
         M=='06' and D=='06' and
         'birth' or
@@ -65,6 +70,10 @@ function THEME.set(theme)
         BG.setDefault('firework')
         BGM.setDefault('spring festival')
         MES.new('info',"★☆新年快乐☆★")
+    elseif theme=='halloween' then
+        BG.setDefault('glow')
+        BGM.setDefault('antispace')
+        MES.new('info',">>Happy halloween<<")
     elseif theme=='zday1' then
         BG.setDefault('lanterns')
         BGM.setDefault('overzero')
@@ -105,8 +114,4 @@ function THEME.getThemeColor(theme)
     return themeColor[theme]
 end
 
-function THEME.fresh()
-    THEME.set(THEME.calculate(os.date('%Y'),os.date('%m'),os.date('%d')))
-end
-
 return THEME