further performance tweaks to sstrstr() function

improves sstrstr function by using KMP string search algorithm

reduces amount of realloc calls in sstrsplit

adds an optimization for one-byte delimiters to sstrsplit (will take effect after planned reimplementation of sstrstr)

reimplementation of sstrsplit

adds new test case for sstrsplit: string ends with delimiter but empty string exceeds list bound

improves handling of special cases delimiter size >= string size in sstrsplit

adds missing stdint.h include for int32_t + fixes possible implicit const cast overflow + adds support for DESTDIR variable in Makefile

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