Add textobjects and indents to c and cpp (#1293)

Indentation of single line statements doesn't work, i.e.

  for (;;)<hit enter>
leads to
  for(;;)
  <cursor here>

Only blocks with curly braces are indented.

runtime/queries/cpp/indents.toml

@@ -0,0 +1,17 @@
+indent = [
+  "compound_statement",
+  "field_declaration_list",
+  "enumerator_list",
+  "parameter_list",
+  "init_declarator",
+  "case_statement",
+  "condition_clause",
+  "expression_statement",
+]
+
+outdent = [
+  "case",
+  "access_specifier",
+  "}",
+  "]",
+]

runtime/queries/cpp/textobjects.scm

@@ -0,0 +1,7 @@
+; inherits: c
+
+(lambda_expression
+  body: (_) @function.inside) @function.around
+
+(class_specifier
+  body: (_) @class.inside) @class.around