Move tests to relevant subprojects (#615)

- Moved test projects to the parent project they belong to
- Improved test stability/corectness
- Improved recursive directory deletion by safely ignoring current- and parent-directory entries.
- Update docs

TactilityFreeRtos/Tests/Source/DispatcherTest.cpp

@@ -0,0 +1,37 @@
+#include "doctest.h"
+#include <Tactility/Dispatcher.h>
+
+using namespace tt;
+
+TEST_CASE("dispatcher should not call callback if consume isn't called") {
+    int counter = 0;
+    Dispatcher dispatcher;
+    dispatcher.dispatch([&counter]() { counter++; });
+    kernel::delayTicks(10);
+
+    CHECK_EQ(counter, 0);
+}
+
+TEST_CASE("dispatcher should be able to dealloc when message is not consumed") {
+    auto* dispatcher = new Dispatcher();
+    auto context = std::make_shared<uint32_t>();
+    dispatcher->dispatch([]() { /* NO-OP */ });
+    delete dispatcher;
+}
+
+TEST_CASE("dispatcher should call callback when consume is called") {
+    int counter = 0;
+    Dispatcher dispatcher;
+
+    CHECK_EQ(dispatcher.dispatch([&counter] { counter++; }), true);
+    CHECK_EQ(dispatcher.consume(100), 1);
+
+    CHECK_EQ(counter, 1);
+}
+
+TEST_CASE("message should be passed on correctly") {
+    Dispatcher dispatcher;
+
+    dispatcher.dispatch([]() { /* NO-OP */ });
+    dispatcher.consume(100);
+}