refactor(sonar): assorted small fixes

- empty() instead of size() comparisons (cpp:S1155)
- member initialisers in declaration order (cpp:S3229)
- no redundant c_str() when a std::string is accepted (cpp:S7121)
- contains() on associative containers (cpp:S6171)
- const reference instead of a copying range-for (cpp:S6032)
- starts_with() for prefix checks (cpp:S6178)
- no std::move on temporaries (cpp:S5274)
- has_value() on std::optional (cpp:S7172)
- bool literals for bool members (cpp:S5820)
- inline only on the definition (cpp:S3548)
- explicit base access specifier (cpp:S5965)
- explicit element access instead of dereferencing an array (cpp:S7116)
- rely on the C++20 rewritten operator!= (cpp:S6186)

input/drivermouseinput.cpp

@@ -174,7 +174,7 @@ drivermouse_input::recall_bindings() {
 	if (fs::path appPath = user_config_path("eu07_input-mouse.ini"); !appPath.empty() && fs::exists(appPath))
 		filePath = appPath.string();
 
-    cParser bindingparser(filePath.c_str(), cParser::buffer_FILE);
+    cParser bindingparser(filePath, cParser::buffer_FILE);
 
     if (false == bindingparser.ok()) {
         return false;