More InstallZip refactoring, add options for install directory where applicable

Common/StringUtils.cpp

@@ -93,6 +93,12 @@ long parseLong(std::string s) {
 	return value;
 }
 
+bool containsNoCase(std::string_view haystack, std::string_view needle) {
+	auto pred = [](char ch1, char ch2) { return std::toupper(ch1) == std::toupper(ch2); };
+	auto found = std::search(haystack.begin(), haystack.end(), needle.begin(), needle.end(), pred);
+	return found != haystack.end();
+}
+
 bool CharArrayFromFormatV(char* out, int outsize, const char* format, va_list args)
 {
 	int writtenCount = vsnprintf(out, outsize, format, args);