Enhancements

Fix error when parsing some Surge configurations.
Fix not filtering USER-AGENT and URL-REGEX rules for Surfboard configurations. (Issue [#127](https://github.com/tindy2013/subconverter/issues/127)).
Add support for specifying tolerance and timeout for some proxy groups. (Issue [#121](https://github.com/tindy2013/subconverter/issues/121)).
Add keeping comments and blank lines for more sections in Quantumult X configurations.
Add rule type match to filter rules.
Optimize codes.

base/pref.ini

@@ -142,13 +142,13 @@ surge_ruleset=!!import:snippets/rulesets.txt
 [clash_proxy_group]
 ;Generate Clash Proxy Group with the following patterns. Node filterting rule supports regular expression.
 ;Format: Group_Name`select`Rule_1`Rule_2`...
-;        Group_Name`url-test|fallback|load-balance`Rule_1`Rule_2`...`test_url`interval
+;        Group_Name`url-test|fallback|load-balance`Rule_1`Rule_2`...`test_url`interval[,timeout][,tolerance]
 ;Rule with "[]" prefix will be added directly.
 
 ;custom_proxy_group=Proxy`select`.*`[]AUTO`[]DIRECT`.*
-;custom_proxy_group=UrlTest`url-test`.*`http://www.gstatic.com/generate_204`300
-;custom_proxy_group=FallBack`fallback`.*`http://www.gstatic.com/generate_204`300
-;custom_proxy_group=LoadBalance`load-balance`.*`http://www.gstatic.com/generate_204`300
+;custom_proxy_group=UrlTest`url-test`.*`http://www.gstatic.com/generate_204`300,5,100
+;custom_proxy_group=FallBack`fallback`.*`http://www.gstatic.com/generate_204`300,5
+;custom_proxy_group=LoadBalance`load-balance`.*`http://www.gstatic.com/generate_204`300,,100
 ;custom_proxy_group=SSID`ssid`default_group`celluar=group0,ssid1=group1,ssid2=group2
 
 ;custom_proxy_group=g1`select`!!GROUPID=0