Switch to 2.0 branch (#1152)

* Adapt boards to v2 partition tables

* fix esp log error

* fix display style

* reset emotion after download assets

* fix compiling

* update assets default url

* Add user only tools

* Add image cache

* smaller cache and buffer, more heap

* use MAIN_EVENT_CLOCK_TICK to avoid audio glitches

* bump to 2.0.0

* fix compiling errors

---------

Co-authored-by: Xiaoxia <terrence.huang@tenclass.com>

main/boards/common/board.cc

@@ -66,7 +66,7 @@ Led* Board::GetLed() {
     return &led;
 }
 
-std::string Board::GetJson() {
+std::string Board::GetSystemInfoJson() {
     /* 
         {
             "version": 2,
@@ -159,4 +159,8 @@ std::string Board::GetJson() {
     // Close the JSON object
     json += R"(})";
     return json;
+}
+
+Assets* Board::GetAssets() {
+    return nullptr;
 }