Simplify static_dict

* Convert `IsMatch(dict, ...)` into a member method. The original `IsMatch` is marked as deprecated - and we probably can delete it, but it will require a major release due to being a breaking change. So for now, lets keep it, but remove it when releasing a new breaking version
* Same for `BrotliFindAllStaticDictionaryMatches`
* lots of internal simplifications - like using direct comparisons, using bools, etc

src/enc/backward_references/hq.rs

@@ -20,8 +20,7 @@ use crate::enc::constants::{kCopyExtra, kInsExtra};
 use crate::enc::encode;
 use crate::enc::literal_cost::BrotliEstimateBitCostsForLiterals;
 use crate::enc::static_dict::{
-    BrotliDictionary, BrotliFindAllStaticDictionaryMatches, FindMatchLengthWithLimit,
-    BROTLI_UNALIGNED_LOAD32,
+    BrotliDictionary, FindMatchLengthWithLimit, BROTLI_UNALIGNED_LOAD32,
 };
 use crate::enc::util::{floatX, FastLog2, FastLog2f64};
 
@@ -382,13 +381,12 @@ where
     {
         let minlen = max(4, best_len.wrapping_add(1));
         if dictionary.is_some()
-            && BrotliFindAllStaticDictionaryMatches(
-                dictionary.unwrap(),
+            && dictionary.unwrap().find_all_matches(
                 &data[cur_ix_masked..],
                 minlen,
                 max_length,
                 &mut dict_matches[..],
-            ) != 0
+            )
         {
             assert!(params.use_dictionary);
             let maxlen = min(37, max_length);