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>

wiki/testing/Bootloader-test.md

@@ -0,0 +1,35 @@
+1. `# Clean flash`
+2. `make -C bootloader flash` `# Load bootloader`
+3.  `# reboot device`
+    * Press right
+    * Press left
+    * Wait 0.1 s
+    * Release left
+    * Release right
+4. Wait 0.5 s
+5. `# Expect no FW`
+    * Expect: no uart welcome message
+    * Expect: red led on
+    * Expect: no USB
+6. `# reboot device and go to DFU`
+    * Press left 
+    * Press right
+    * Wait 0.1 s
+    * Release left
+    * Wait 0.5 s 
+    * Release right
+7. Wait 0.5 s
+8. `# Expect DFU`
+    * Expect: blue led on
+    * Expect: USB: DFU
+9. `target_f2/deploy-dfu.sh` `# load FW`
+10. `# reboot device`
+    * Press right
+    * Press left
+    * Wait 0.1 s
+    * Release left
+    * Release right
+11. Wait 0.5 s
+12. `# Expect FW`
+    * Expect: uart welcome message
+    * Expect: USB Flipper CDC