misc: add format files for clang-format and editorconfig

.clang-format

@@ -0,0 +1,17 @@
+---
+BasedOnStyle: GNU
+IndentWidth: 4
+---
+Language: Cpp
+PointerAlignment: Right
+ColumnLimit: 120
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterEnum: false
+  AfterClass: false
+  SplitEmptyFunction: true
+  AfterFunction: true
+  AfterStruct: false
+
+SpaceBeforeParens: ControlStatements
+Cpp11BracedListStyle: true

.editorconfig

@@ -0,0 +1,17 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+indent_style = space
+indent_size = 4
+max_line_length = 70
+
+[{meson.build,PKGBUILD}]
+indent_size = 2
+
+[*.scd]
+indent_style = tab
+trim_trailing_whitespace = false