Removed syntastic and replaced it with ale

Read more here:
https://github.com/w0rp/ale

sources_non_forked/ale/ale_linters/cpp/cppcheck.vim

@@ -0,0 +1,39 @@
+" Author: Bart Libert <bart.libert@gmail.com>
+" Description: cppcheck linter for cpp files
+
+call ale#Set('cpp_cppcheck_executable', 'cppcheck')
+call ale#Set('cpp_cppcheck_options', '--enable=style')
+
+function! ale_linters#cpp#cppcheck#GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'cpp_cppcheck_executable')
+endfunction
+
+function! ale_linters#cpp#cppcheck#GetCommand(buffer) abort
+    " Search upwards from the file for compile_commands.json.
+    "
+    " If we find it, we'll `cd` to where the compile_commands.json file is,
+    " then use the file to set up import paths, etc.
+    let l:compile_commmands_path = ale#path#FindNearestFile(a:buffer, 'compile_commands.json')
+
+    let l:cd_command = !empty(l:compile_commmands_path)
+    \   ? ale#path#CdString(fnamemodify(l:compile_commmands_path, ':h'))
+    \   : ''
+    let l:compile_commands_option = !empty(l:compile_commmands_path)
+    \   ? '--project=compile_commands.json '
+    \   : ''
+
+    return l:cd_command
+    \   . ale#Escape(ale_linters#cpp#cppcheck#GetExecutable(a:buffer))
+    \   . ' -q --language=c++ '
+    \   . l:compile_commands_option
+    \   . ale#Var(a:buffer, 'cpp_cppcheck_options')
+    \   . ' %t'
+endfunction
+
+call ale#linter#Define('cpp', {
+\   'name': 'cppcheck',
+\   'output_stream': 'both',
+\   'executable_callback': 'ale_linters#cpp#cppcheck#GetExecutable',
+\   'command_callback': 'ale_linters#cpp#cppcheck#GetCommand',
+\   'callback': 'ale#handlers#cppcheck#HandleCppCheckFormat',
+\})