Adding clang-tidy cmake files.

.clang-tidy

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+---
+Checks: '-*,readability-identifier-naming'
+CheckOptions:
+  - { key: readability-identifier-naming.NamespaceCase,       value: lower_case }
+  - { key: readability-identifier-naming.ClassCase,           value: CamelCase  }
+  - { key: readability-identifier-naming.PrivateMemberPrefix, value: _          }
+  - { key: readability-identifier-naming.StructCase,          value: CamelCase  }
+  - { key: readability-identifier-naming.FunctionCase,        value: lower_case }
+  - { key: readability-identifier-naming.VariableCase,        value: lower_case }
+  - { key: readability-identifier-naming.GlobalConstantCase,  value: UPPER_CASE }
+WarningsAsErrors: '-*'
+HeaderFilterRegex: '*.h'
+FormatStyle: llvm

cmake/StaticAnalyzers.cmake

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+if( ENABLE_CLANG_TIDY )
+  find_program( CLANGTIDY clang-tidy )
+  if( CLANGTIDY )
+    set( CMAKE_CXX_CLANG_TIDY ${CLANGTIDY} -extra-arg=-Wno-unknown-warning-option )
+    message( "Clang-Tidy finished setting up." )
+  else()
+    message( SEND_ERROR "Clang-Tidy requested but executable not found." )
+  endif()
+endif()
+
+if( ENABLE_CPPCHECK )
+  find_program( CPPCHECK cppcheck )
+  if( CPPCHECK )
+    set( CMAKE_CXX_CPPCHECK ${CPPCHECK} --suppress=missingInclude --enable=all
+      --inline-suppr --inconclusive -i ${CMAKE_SOURCE_DIR}/imgui/lib )
+    message( "Cppcheck finished setting up." )
+  else()
+    message( SEND_ERROR "Cppcheck requested but executable not found." )
+  endif()
+endif()