docs(*): update docs v2.3.8

* release/2.3.7:
  docs(*): update changelog
  chore(*): update version
  docs(*): update ORB build
  docs(*): update slam

.commitlintrc.js

@@ -0,0 +1,11 @@
+module.exports = {
+  extends: ['@commitlint/config-conventional'],
+  rules: {
+  'type-enum': [2, 'always', [
+    "feat", "fix", "docs", "style", "refactor", "perf", "test", "build", "ci", "chore", "revert"
+  ]],
+  'scope-empty': [2, 'never'],
+  'subject-full-stop': [0, 'never'],
+  'subject-case': [0, 'never']
+  }
+};

.gitignore

@@ -7,6 +7,8 @@ _build/
 _install/
 _output/
 
+/docs/_doxygen/
+
 /get-pip.py
 
 /*INFO*
@@ -16,11 +18,15 @@ _output/
 
 /plugins/
 
+/3rdparty/ceres/
 /3rdparty/opencv/
 /pkginfo.sh
 /*.nsi
 /*.exe
 
+/node_modules/
+/package-lock.json
+
 # ros
 
 /wrappers/ros/build

3rdparty/easyloggingpp/.gitignore

@@ -0,0 +1,7 @@
+build-*
+*.pro.user
+.DS_Store
+release.info
+bin/*
+logs/*
+experiments/*

3rdparty/easyloggingpp/LICENSE

@@ -0,0 +1,25 @@
+The MIT License (MIT)
+
+Copyright (c) 2012-2018 Zuhd Web Services
+Copyright (c) 2012-2018 @abumusamq
+
+https://github.com/zuhd-org/
+https://zuhd.org
+https://muflihun.com
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.