re-add solidity reset

libs/remix-debug/src/Ethdebugger.ts

@@ -180,6 +180,7 @@ export class Ethdebugger {
   unLoad () {
     this.traceManager.init()
     this.codeManager.clear()
+    this.solidityProxy.reset()
     this.event.trigger('traceUnloaded')
   }
 

libs/remix-debug/src/solidity-decoder/solidityProxy.ts

@@ -20,6 +20,14 @@ export class SolidityProxy {
     this.compilationResult = compilationResult
   }
 
+  /**
+    * reset the cache and apply a new @arg compilationResult
+    *
+    */
+  reset () {
+    this.cache.reset()
+  }
+
   /**
     * retrieve the compiled contract name at the @arg vmTraceIndex (cached)
     *