Maintenance update

• Upgrade rxdart to ^0.24.0
• Apply pedantic rules
  • For some reason, I forgot to include the package on 0.1.3+2, so my linter wouldn't behave correctly
• Remove pubspec.lock from git, as it is recommended for library packages.

v0.1.4

• Added a new parameter to MagicEye to control preview alignment.
• Possibly Breaking Change: By default, the alignment is now topCenter.

Stricter rules means less error proness

• Added a analysis_options.yaml file
  • Included pedantic linter rules
  • Set up stricter rules for static anasysis

v0.1.3+1

• Fix regression (issue #3)

v0.1.3

• Fix defaultCameraControlLayer secondChild getting the firstChild hit

v0.1.2

• Assert that MagicEye parameters are not null, except for key
• Export default layers
• Constrained example orientation with SystemChrome.setPreferredOrientations

v0.1.1

• Now the default allowed directions is not portrait, but all of them, as it's more intuitive
• Little improvement on in-code documentation
• Possibly Breaking Change: Change DeviceDirection enum to represent more intuitively the directions. Now, landscape is landscapeLeft, and landscapeReversed is landscapeRight