Update docs and fix bugs (#149)

Improved the docs for the 3 main Tactility projects. I also fixed some inaccuracies and bugs in certain APIs as I went through the code.

TactilityCore/Source/file/File.h

@@ -7,7 +7,17 @@ namespace tt::file {
 
 long getSize(FILE* file);
 
+/** Read a file and return its data.
+ * @param[in] filepath the path of the file
+ * @param[out] size the amount of bytes that were read
+ * @return null on error, or an array of bytes in case of success
+ */
 std::unique_ptr<uint8_t[]> readBinary(const std::string& filepath, size_t& outSize);
+
+/** Read a file and return a null-terminated string that represents its content.
+ * @param[in] filepath the path of the file
+ * @return null on error, or an array of bytes in case of success. Empty string returns as a single 0 character.
+ */
 std::unique_ptr<uint8_t[]> readString(const std::string& filepath);
 
 }