re-organize project structure a bit + add icons

src/VisualEditor/transition_label.grammar

@@ -1,128 +0,0 @@
-start = tlabel / comment
-
-tlabel = _ trigger:trigger _ guard:("[" _ guard _ "]")? _ actions:("/" _ actions )? _ {
-  return {
-    kind: "transitionLabel",
-    trigger,
-    guard: guard ? guard[2] : {kind: "literal", value: true},
-    actions: actions ? actions[2] : [],
-  };
-}
-
-trigger = afterTrigger / entryTrigger / exitTrigger / eventTrigger
-
-eventTrigger = event:identifier {
-	return {kind: "event", event};
-}
-
-afterTrigger = "after" _ dur:durationMs {
-	return {kind: "after", durationMs: dur};
-}
-
-entryTrigger = "entry" {
-	return {kind: "entry"};
-}
-
-exitTrigger = "exit" {
-	return {kind: "exit"};
-}
-
-
-durationMs = num:number _ u:timeUnit {
-	return num * (u === "s" ? 1000 : 1);
-}
-
-timeUnit = "ms" / "s" {
-	return text();
-}
-
-guard = expr
-
-actions = head:action tail:(_ ";" _ action)* _ ";"? {
-	return [head, ...tail.map(t => t[3])];
-}
-action = assignment / raise
-
-assignment = lhs:identifier _ "=" _ rhs:expr {
-	return {kind: "assignment", lhs, rhs};
-}
-
-identifier = ("_" / [a-zA-Z0-9])+ {
-	return text();
-}
-
-number = [0-9]+ {
-	return parseInt(text());
-}
-
-expr = compare
-
-compare = sum:sum rest:((_ ("==" / "!=" / "<" / ">" / "<=" / ">=") _) compare)? {
-	if (rest === null) {
-    	return sum;
-    }
-    return {
-        kind: "binaryExpr",
-        operator: rest[0][1],
-        lhs: sum,
-        rhs: rest[1],
-    };
-}
-
-sum = prod:product rest:((_ ("+" / "-") _) sum)? {
-	if (rest === null) {
-    	return prod;
-    }
-    return {
-        kind: "binaryExpr",
-        operator: rest[0][1],
-        lhs: prod,
-        rhs: rest[1],
-    };
-}
-
-product = atom:atom rest:((_ ("*" / "/") _) product)? {
-	if (rest === null) {
-    	return atom;
-    }
-    return {
-        kind: "binaryExpr",
-        operator: rest[0][1],
-        lhs: atom,
-        rhs: rest[1],
-    };
-}
-
-atom = nested / literal / ref
-
-nested = "(" _ expr:expr _ ")" {
-	return expr;
-}
-
-literal = value:(number / boolean) {
-	return {kind: "literal", value}
-}
-
-ref = variable:identifier {
-	return {kind: "ref", variable}
-}
-
-boolean = ("true" / "false") {
-	return text() === "true";
-}
-
-raise = "^" _ event:identifier {
-	return {kind: "raise", event};
-}
-
-_ "whitespace"
-  = (comment / [ \t\n\r])*
-  { return null; }
-
-comment = "//" _ text:.* _ ('\n' / !.) {
-	return {
-    	kind: "comment",
-        text: text.join(''),
-    };
-}
-