Fix various regression in behavior of redirect-rule=

Related issue:
- uBlockOrigin/uBlock-issues#1388

Fixed the special `none` redirect resource no longer being
enforced.

Fixed the enforcement of `important` redirect rules over
exceptions and non-important ones.

src/js/redirect-engine.js

@@ -305,6 +305,7 @@ RedirectEngine.prototype.tokenToURL = function(
 /******************************************************************************/
 
 RedirectEngine.prototype.hasToken = function(token) {
+    if ( token === 'none' ) { return true; }
     const asDataURI = token.charCodeAt(0) === 0x25 /* '%' */;
     if ( asDataURI ) {
         token = token.slice(1);

src/js/static-net-filtering.js

@@ -4261,8 +4261,13 @@ FilterContainer.parseRedirectRequestValue = function(modifier) {
 };
 
 FilterContainer.compareRedirectRequests = function(a, b) {
-    if ( (a.bits & AllowAction) !== 0 ) { return -1; }
-    if ( (b.bits & AllowAction) !== 0 ) { return 1; }
+    const abits = a.bits, bbits = b.bits;
+    if ( abits !== bbits ) {
+        if ( (abits & Important) !== 0 ) { return 1; }
+        if ( (bbits & Important) !== 0 ) { return -1; }
+        if ( (abits & AllowAction) !== 0 ) { return -1; }
+        if ( (bbits & AllowAction) !== 0 ) { return 1; }
+    }
     const { token: atok, priority: aint } =
         FilterContainer.parseRedirectRequestValue(a.modifier);
     if ( µb.redirectEngine.hasToken(atok) === false ) { return -1; }