added "break" and "continue" statements

a LoopState was added to the CCompilerState struct which keeps track of breaks, start chunk index, and the start scope of the active loop.
Also, break.cosmo was added to the examples directory, 'continue' and 'break' work as expected.

examples/break.cosmo

@@ -0,0 +1,26 @@
+// just testing continues and breaks
+
+for (var x = 0; x < 700; x++) do
+    for (var i = 0; true; i++) do
+        var str = i .. "." .. x
+        if (i == 998) then
+            print(i .. " reached")
+            break
+        end
+        
+        print("for cont- " .. str)
+        continue
+    end
+
+    var i = 0
+    while true do
+        var str = i .. "." .. x
+        if (i++ == 1034) then
+            print("done")
+            break
+        end
+
+        print("while cont- " .. str)
+        continue
+    end
+end