Add lint_off -match waivers (#2102)

* Add more directives to configuration files

Allow to set the same directives in configuration files that can also
be set by comment attributes (such as /* verilator public */ etc).

* Add support for lint messsage waivers

Add configuration file switch '-match' for lint_off. It takes a string
with wildcards allowed and warnings will be matched against it (if
rule and file also match). If it matches, the warning is waived.

Fixes #1649 and #1514 
Closes #2072

src/V3String.cpp

@@ -74,6 +74,14 @@ bool VString::wildmatch(const char* s, const char* p) {
     return (*s == '\0');
 }
 
+bool VString::wildmatch(const string& s, const string& p) {
+    return wildmatch(s.c_str(), p.c_str());
+}
+
+bool VString::isWildcard(const string &p) {
+    return ((p.find("*") != string::npos) || (p.find("?") != string::npos));
+}
+
 string VString::dot(const string& a, const string& dot, const string& b) {
     if (b=="") return a;
     if (a=="") return b;