PlatformIO Core 3.5.4

Improved removing of default build flags using build_unflags option (issue #1712)
Export LIBS, LIBPATH, and LINKFLAGS data from project dependent libraries to the global build environment
Don't export CPPPATH data of project dependent libraries to framework's build environment (issue #1665)
Handle "architectures" data from "library.properties" manifest in lib_compat_mode = strict
Added workaround for Python SemVer package's issue #61 with caret range and pre-releases
Replaced conflicted "env" pattern by "sysenv" for "platformio.ini" Dynamic Variables" (issue #1705)
Removed "date&time" when processing project with platformio run command (issue #1343)
Fixed issue with invalid LD script if path contains space
Fixed preprocessor for Arduino sketch when function returns certain type (issue #1683)
Fixed issue when platformio lib uninstall removes initial source code (issue #1023)

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