Refactor code to be more compliant to modern C++ standards

.clang-format

@@ -1,3 +1,5 @@
 BasedOnStyle: LLVM
-IndentWidth: 4
+IndentWidth: 2
 PointerAlignment: Left
+ColumnLimit: 100
+AccessModifierOffset: -2

.clang-tidy

@@ -0,0 +1,65 @@
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+---
+# Configure clang-tidy for this project.
+
+# Disabled:
+#  -google-readability-namespace-comments the *_CLIENT_NS is a macro, and
+#   clang-tidy fails to match it against the initial value.
+Checks: >
+  -*,
+  bugprone-*,
+  google-*,
+  misc-*,
+  modernize-*,
+  performance-*,
+  portability-*,
+  readability-*,
+  -modernize-use-trailing-return-type,
+  -bugprone-implicit-widening-of-multiplication-result,
+  -modernize-avoid-c-arrays,
+  -readability-identifier-length,
+  -misc-non-private-member-variables-in-classes,
+
+# -google-readability-namespace-comments,
+# -google-runtime-int,
+# -google-runtime-references,
+# -misc-non-private-member-variables-in-classes,
+# -readability-named-parameter,
+# -readability-braces-around-statements,
+# -readability-magic-numbers,
+#
+# Turn all the warnings from the checks above into errors.
+WarningsAsErrors: "*"
+
+CheckOptions:
+  - { key: readability-identifier-naming.NamespaceCase,          value: lower_case }
+  - { key: readability-identifier-naming.ClassCase,              value: CamelCase  }
+  - { key: readability-identifier-naming.StructCase,             value: CamelCase  }
+  - { key: readability-identifier-naming.TemplateParameterCase,  value: CamelCase  }
+  - { key: readability-identifier-naming.FunctionCase,           value: lower_case }
+  - { key: readability-identifier-naming.VariableCase,           value: lower_case }
+  - { key: readability-identifier-naming.PrivateMemberPrefix,    value: _          }
+  - { key: readability-identifier-naming.ProtectedMemberPrefix,  value: _          }
+  - { key: readability-identifier-naming.MacroDefinitionCase,    value: UPPER_CASE }
+  - { key: readability-identifier-naming.EnumConstantCase,         value: CamelCase }
+  - { key: readability-identifier-naming.EnumConstantPrefix,       value: k         }
+  - { key: readability-identifier-naming.ConstexprVariableCase,    value: CamelCase }
+  - { key: readability-identifier-naming.ConstexprVariablePrefix,  value: k         }
+  - { key: readability-identifier-naming.GlobalConstantCase,       value: UPPER_CASE }
+  - { key: readability-identifier-naming.MemberConstantCase,       value: CamelCase }
+  - { key: readability-identifier-naming.MemberConstantPrefix,     value: k         }
+  - { key: readability-identifier-naming.StaticConstantCase,       value: CamelCase }
+  - { key: readability-identifier-naming.StaticConstantPrefix,     value: k         }

CMakeLists.txt

@@ -9,6 +9,9 @@ project(mcpp VERSION ${PROJECT_VERSION})
 
 set(CMAKE_CXX_STANDARD 17)
 
+# Used for clang-tidy
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
 if(NOT CMAKE_BUILD_TYPE)
   set(CMAKE_BUILD_TYPE Release)
 endif()
@@ -72,3 +75,5 @@ target_link_libraries(video_mc ${PROJECT_NAME})
 target_link_libraries(obj_mc ${PROJECT_NAME})
 
 add_custom_target(examples DEPENDS hello_minecraft pyramid game_of_life minesweeper video_mc obj_mc)
+
+

example/.clang-tidy

@@ -0,0 +1 @@
+Checks: "-*"