Filesystem improvements and more (#148)

- Rename `assets` and `config` partitions to `system` and `data`
- Change partition type from `spiffs` to `fat`, so we can have sub-directories
- Fix crash when doing WiFi scan: Increased system event task size to 3kB. 
- Free up IRAM on ESP32 (it was required for the Core2, but I also freed up the same amount for Yellow Board)
- Introduced `Paths` objects that can be retrieved by `AppContext` and `ServiceContext`. Apps and services now have their own relative paths. Assets were re-arranged into the correct paths.
- Rename simulator window title to "Tactility"
- Refactored statusbar widget so it persists icon paths properly (it kept a const char* reference, but didn't copy it, so it crashed when the related std::string was destroyed)
- Created `Partitions.h` to expose some useful variables
- Moved USB config in various `sdkconfig`  (it was part of the "default" section, but it shouldn't be)
- Updated domain name

TactilityHeadless/Source/service/ServiceInstance.cpp

@@ -1,6 +1,7 @@
 #include <utility>
 
 #include "service/ServiceInstance.h"
+#include "service/ServiceInstancePaths.h"
 
 namespace tt::service {
 
@@ -21,4 +22,8 @@ void ServiceInstance::setData(std::shared_ptr<void> newData) {
     mutex.release();
 }
 
+std::unique_ptr<Paths> ServiceInstance::getPaths() const {
+    return std::make_unique<ServiceInstancePaths>(manifest);
+}
+
 }