Addon Manager: Refactor Macro parser

src/Mod/AddonManager/AddonManagerTest/data/DoNothing.FCMacro

@@ -4,7 +4,7 @@ __Title__ = 'Do Nothing'
 __Author__ = 'Chris Hennes'
 __Version__ = '1.0'
 __Date__ = '2022-02-28'
-__Comment__ = 'Do absolutely nothing. For Addon Manager unit tests.'
+__Comment__ = 'Do absolutely nothing. For Addon Manager integration tests.'
 __Web__ = 'https://github.com/FreeCAD/FreeCAD'
 __Wiki__ = ''
 __Icon__ = 'not_real.png'
@@ -13,5 +13,18 @@ __Status__ = 'Very Stable'
 __Requires__ = ''
 __Communication__ = 'Shout into the void'
 __Files__ = 'file1.py, file2.py, file3.py'
+__Xpm__ = """/* XPM */
+static char * blarg_xpm[] = {
+"16 7 2 1",
+"* c #000000",
+". c #ffffff",
+"**..*...........",
+"*.*.*...........",
+"**..*..**.**..**",
+"*.*.*.*.*.*..*.*",
+"**..*..**.*...**",
+"...............*",
+".............**."
+};"""
 
 print("Well, not quite *nothing*... it does print this line out.")