Font Locking for negation operator, and other fixes

• Add support for font-locking negation operator.
• Fix swift-mode:debug-ios-app for newer Xcode.
• Fix indentations and font-locks.
• Fix documentations.
• Fix GitHub Actions.
• Migrated to Eldev.

Thanks @jcs090218, @woolsweater, and @danielmartin.

Fix indentation of switch-case

If swift-mode:switch-case-offset is equal to or greater than swift-mode:basic-offset, the body of switch statements are indented to swift-mode:switch-case-offset + swift-mode:basic-offset.

Before:

switch foo {
      case 1:
    print(1)
      default:
    print("other")
}

After:

switch foo {
      case 1:
          print(1)
      default:
          print("other")
}

Thanks @woolsweater .

Swift 5.3 and REPL fix

• Highlight #filePath
• Support multi-parttern catch clauses
• Fix unreadable characters appearing in REPL prompt

Fix indentation of generic parameters

Fixed indentation of generic parameters.

Example:

struct Foo<
  A: A,
  A: A, A: A
> {
}

Added some keyword of Swift 5.1.

Other small fixes.

Fix indentation after `class` modifier

Fix indentation after class token used as a modifier:

class Foo {
  public
    class
    var
    foo = 1
}

Trivia:

class Foo {
  // Nested class named "final"
  class final {
  }

  // Non-overridable class method named "foo"
  class final func foo() {
  }
}

Improved Imenu and consistent behavior in multiline comments

• Improved Imenu and speedbar support
• More consistent electric indents and adaptive-fills inside multiline comments
• Chooses right executables for REPL, debugger, and other build tools
• The buffer name of REPL is now *Swift REPL [cmd-string]* where cmd-string is the command name such as swift
• Fixes beginning-of-defun hanging at the beginning of buffer
• Updates highlighting of class names for Swift 5.0

Raw string literal

Adds support for raw string literal of Swift 5. For example: #"c:\windows\system32"#.

This release also enchances the hilighting of compiler directives.

Fix mark-defun

This is a minor fix for swift-mode:mark-defun and swift-mode:mark-sentence.

Emacs 26 style mark-defun

swift-mode:mark-defun and swift-mode:mark-sentence now take a numeric argument. It repeats that count. If the count is negative, reverse direction.

Improved font-lock

• More comprehensive and consistent highlighting of symbols in standard library.
• Highlighting symbols in standard library is now optional.