Add minunit test framework (#168)

* add minunit tests

* fix logging

* ignore unexisting time service on embedded targets

* fix warning, issue with printf

* add exitcode

* migrate to printf

* indicate test by leds

* add testing description

* redesigned minunit tests to allow testing in separate files

* add test step for local target

* add failure test

* add restore test_check

* testing description

Co-authored-by: rusdacent <rusdacentx0x08@gmail.com>
Co-authored-by: DrZlo13 <who.just.the.doctor@gmail.com>

core/flipper.h

@@ -29,3 +29,5 @@ extern "C" {
 #define INPUT GpioModeInput
 #define LOW false
 #define HIGH true
+
+void set_exitcode(uint32_t _exitcode);