[Audio 6/?] Build Soundfonts and the Soundfont Table (#2056)

* [Audio 6/?] Build Soundfonts and the Soundfont Table

* Improve lots of error messages

* First suggested changes

* Make audio build debugging more friendly

Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

* Some fixes from MM review

* Make soundfont_table.h generation depend on the samplebank xmls since they are read, report from which soundfont the invalid pointer indirect warning originates from

---------

Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

linker_scripts/soundfont.ld

@@ -0,0 +1,19 @@
+OUTPUT_ARCH (mips)
+
+/* Soundfont Linker Script, maps data into rodata and adds a file length symbol */
+
+SECTIONS {
+
+    .rodata :
+    {
+        *(.data*)
+        *(.rodata*)
+        . = ALIGN(16);
+        __LEN__ = . - ADDR(.rodata);
+    }
+
+    /DISCARD/ :
+    {
+        *(*);
+    }
+}