[IMPROVEMENT] Upgrade libgpac based on Hori75's branch

[harrynull]

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Upgrade libgpac to 0.7.0 0.7.1.

The pr fixes the failing sample, based on @Hori75 's pr #871 .

List of changes I have made: (For future references when upgrading it...)

• Change box_funcs.c: comment out some of the lines to avoid introduce too many files. See dfb26f49a265c1cf383a4016fc2ca015bcfb7d4d
• In gpac/configuration.h, comment out all #define GPAC_MEMORY_TRACKING (there are currently two of it) and #else #error "Unknown target platform used with static configuration file" (To avoid compilation errors in Linux)
• In gpac/isomedia.h, add more constants. See dfb26f49a265c1cf383a4016fc2ca015bcfb7d4d
• Make gpac/revision.h yourself; update the version.
• In /gpac/setup.h, change functions like void* gf_malloc(size_t size); to #define gf_malloc malloc (to avoid introducing alloc.c)
• In isom_write.c, remove line #include <gpac/iso639.h>

Please don't merge until the CI platforms run it

[canihavesomecoffee]

@harrynull The platform will most likely run it in a couple of hours; it's queued as next one to run after the current test finishes.