Making flex re-entrant and releasing all acquired resources at the end#675

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mingodad wants to merge 4 commits intowestes:masterfrom

Commits on Oct 1, 2024

Moved all globals/static to a structure
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Commits on Oct 2, 2024

Almost fully reentrant now with no memory leaks, need look at "static struct flex_backend_t *backend"
mingodad
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temporary fix for parse.c, need manual call
mingodad
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Commits on Oct 3, 2024

Replaced the last remaining global
mingodad
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