fix: read mame hiscore.dat where the cores open it

mame2000 opens hiscore.dat, history.dat and mameinfo.dat from IMAMEBASEPATH, the content directory (src/libretro/fileio.c:1002-1014, libretro.c:1044-1052). mame2014 and mame2015 open hiscore.dat through emu_file with no search path, the working directory (src/emu/hiscore.c:330-337, fileio.c:141-143). With no load_from the entries claimed system/ and the packs shipped files neither core opens there. ANoteOutsideTheSystemDirCarriesLoadFrom holds libretro notes and load_from together.

emulators/mame2000.yml

@@ -34,15 +34,16 @@ notes: |
 
 files:
   - name: hiscore.dat
+    load_from: content_dir
     required: false
     category: game_data
     system: arcade
     sha1: "21ddda0c61bd4f1cc04fb9d09e16d403d620f9e8"
     md5: "9b262149ec70cbda741a8ba55784f8e1"
     size: 36182
-    source_ref: "src/hiscore.c:18,132-146,252-254, src/cpuintrf.c:664-666"
+    source_ref: "src/hiscore.c:18,132-146,252-254, src/cpuintrf.c:664-666, src/libretro/fileio.c:1002-1014, src/libretro/libretro.c:1044-1052"
     note: >-
-      high score definitions, loaded from ROM directory. metadata/hiscore.dat
+      high score definitions, opened from IMAMEBASEPATH, the directory of the loaded content. metadata/hiscore.dat
       of the core repository. is_mem_range reads only "cpu:addr:len:start:end"
       lines under a "gamename:" header.
 
@@ -55,18 +56,20 @@ files:
     note: "cheat definitions, loaded from system_dir/mame2000/cheat/"
 
   - name: history.dat
+    load_from: content_dir
     required: false
     category: game_data
     system: arcade
-    source_ref: "src/datafile.c:52,281,541"
-    note: "game history database, loaded from ROM directory"
+    source_ref: "src/datafile.c:52,281,541, src/libretro/fileio.c:1002-1014"
+    note: "game history database, opened from IMAMEBASEPATH, the directory of the loaded content"
 
   - name: mameinfo.dat
+    load_from: content_dir
     required: false
     category: game_data
     system: arcade
-    source_ref: "src/datafile.c:53,281,568"
-    note: "game technical info database, loaded from ROM directory"
+    source_ref: "src/datafile.c:53,281,568, src/libretro/fileio.c:1002-1014"
+    note: "game technical info database, opened from IMAMEBASEPATH, the directory of the loaded content"
 
   - name: neogeo.zip
     required: true

emulators/mame2014.yml

@@ -102,6 +102,7 @@ notes: |
 files:
   # Data files
   - name: hiscore.dat
+    load_from: working_directory
     required: false
     category: game_data
     system: arcade

emulators/mame2015.yml

@@ -91,6 +91,7 @@ notes: |
 files:
   # Data files
   - name: hiscore.dat
+    load_from: working_directory
     installed_on: [recalbox]
     required: false
     category: game_data