Fix error when metadata fields have numbers in them (e.g. NOTESDESIGNER0) (#61)

Simple fix -- regex for metadata didn't include numbers, but does now.

Fixes #60.

src/tja2fumen/parsers.py

@@ -83,7 +83,7 @@ def split_tja_lines_into_courses(lines: list[str]) -> TJASong:
     current_course_basename = ''
     for line in lines:
         # Only metadata and #START commands are relevant for this function
-        match_metadata = re.match(r"^([A-Z]+):(.*)", line)
+        match_metadata = re.match(r"^([A-Z0-9]+):(.*)", line)
         match_start = re.match(r"^#START(?:\s+(.+))?", line)
 
         # Case 1: Metadata lines

testing/data/dummy_tjas/unsupported.tja

@@ -0,0 +1,63 @@
+// This song contains all unsupported metadata/commands.
+TITLE:Test
+TITLEJA:テスト
+TITLEEN:Test
+SUBTITLE:Test
+SUBTITLEJA:テスト
+SUBTITLEEN:Test
+BPM:120
+OFFSET:-1.00
+DEMOSTART:1.00
+GENRE:J-POP
+SCOREMODE:1
+WAVE:Test.ogg
+MAKER:Test <https://example.com>
+LYRICS:Test.vtt
+SONGVOL:100
+SEVOL:100
+SIDE:1
+LIFE:0
+GAME:Taiko
+HEADSCROLL:1
+BGIMAGE:Test.png
+BGMOVIE:Test.avi
+MOVIEOFFSET:1.00
+PREIMAGE:Test.png
+TAIKOWEBSKIN:dir ../song_skins,name miku,song static,stage none,don fastscroll
+
+COURSE:Oni
+LEVEL:10
+BALLOON:8,8
+SCOREINIT:400
+SCOREDIFF:100
+BALLOONNOR:8,8
+BALLOONEXP:10,10
+BALLOONMAS:12,12
+EXAM1:g,98,100,m
+EXAM2:jp,1000,1150,m
+EXAM3:jb,10,5,l
+GAUGEINCR:Normal
+TOTAL:200
+HIDDENBRANCH:1
+NOTESDESIGNER4:Test
+NOTESDESIGNER3:Test
+NOTESDESIGNER2:Test
+NOTESDESIGNER1:Test
+NOTESDESIGNER0:Test
+
+#BMSCROLL
+#HBSCROLL
+#START
+#SENOTECHANGE 3
+1020304,
+#LYRIC Test lyric
+5000008,
+#DIRECTION 2
+6000008,
+#SUDDEN 2 1
+7000008,
+#JPOSSCROLL 2 760 1
+9000008,
+#END
+
+#NEXTSONG GO!GO!明るい社会,うるまでるび,バラエティ,GO!GO!明るい社会.ogg,560,160

testing/test_command_support.py

@@ -9,6 +9,7 @@ from conftest import convert
 @pytest.mark.parametrize('id_song,err_msg', [
     ['basic_song', None],
     ['basic_song_2P', None],
+    ['unsupported', None],
     ['notes_double_kusudama', None],
     ['notes_hands', None],
     ['notes_sim_only', None],