performance improvements + a good amount of changes

.clang-tidy

@@ -1,38 +0,0 @@
----
-Checks:          'clang-diagnostic-*,clang-analyzer-*,cppcoreguidelines-*,modernize-*,-modernize-use-trailing-return-type'
-WarningsAsErrors: true
-HeaderFilterRegex: ''
-AnalyzeTemporaryDtors: false
-FormatStyle:     google
-CheckOptions:
-  - key:             cert-dcl16-c.NewSuffixes
-    value:           'L;LL;LU;LLU'
-  - key:             cert-oop54-cpp.WarnOnlyIfThisHasSuspiciousField
-    value:           '0'
-  - key:             cppcoreguidelines-explicit-virtual-functions.IgnoreDestructors
-    value:           '1'
-  - key:             cppcoreguidelines-non-private-member-variables-in-classes.IgnoreClassesWithAllMemberVariablesBeingPublic
-    value:           '1'
-  - key:             google-readability-braces-around-statements.ShortStatementLines
-    value:           '1'
-  - key:             google-readability-function-size.StatementThreshold
-    value:           '800'
-  - key:             google-readability-namespace-comments.ShortNamespaceLines
-    value:           '10'
-  - key:             google-readability-namespace-comments.SpacesBeforeComments
-    value:           '2'
-  - key:             modernize-loop-convert.MaxCopySize
-    value:           '16'
-  - key:             modernize-loop-convert.MinConfidence
-    value:           reasonable
-  - key:             modernize-loop-convert.NamingStyle
-    value:           CamelCase
-  - key:             modernize-pass-by-value.IncludeStyle
-    value:           llvm
-  - key:             modernize-replace-auto-ptr.IncludeStyle
-    value:           llvm
-  - key:             modernize-use-nullptr.NullMacros
-    value:           'NULL'
-...
-
-