react-gbajs: add hacks

[macabeus]

Add hacks feature on react-gbajs, and options to turn on it.

[macabeus]

@city41 Maybe that might interest you. I had some difficulties not dropping FPS, but it worked.

If you want to check the FPS, you can apply this patch:

diff --git a/react-gbajs/src/emulator/gba.js b/react-gbajs/src/emulator/gba.js
index d837a4e..e8775fd 100644
--- a/react-gbajs/src/emulator/gba.js
+++ b/react-gbajs/src/emulator/gba.js
@@ -212,7 +212,7 @@ GameBoyAdvance.prototype.runStable = function() {
        this.paused = false;
        this.audio.pause(false);
 
-       if (this.reportFPS) {
+       if (true) {
                runFunc = function() {
                        try {
                                timer += Date.now() - start;
@@ -225,7 +225,8 @@ GameBoyAdvance.prototype.runStable = function() {
                                self.advanceFrame();
                                ++frames;
                                if (frames == 60) {
-                                       self.reportFPS((frames * 1000) / timer);
+                                       console.log((frames * 1000) / timer)
+                                       // self.reportFPS((frames * 1000) / timer);
                                        frames = 0;
                                        timer = 0;
                                }