Add reset and hasImage methods and make generate public (claviska#339)

* Add reset and hasImage methods

* Make generate method public

* Update README

Support hex colors with alpha channel: RGBA and RRGGBBAA (claviska#337)

* Support hex colors with alpha channel: RGBA and RRGGBBAA

Added support for 4 and 8 digit hex colors with alpha channel. Eg: #00ff0080

* Fix max val.

fix typo in .gitattributes (claviska#330)

example where not excluded properly causing the example BMP (1.3MB) to push to users of the lib (like @getkirby)

replace resource with GdImage (claviska#326)

fixes claviska#325

claviska#303: Update data type from int to float. (claviska#321)

* Update data type from int to float.

* Revert back by mistake the maxWidth

closes claviska#317 (claviska#318)

Signed-off-by: bnomei <[email protected]>

closes claviska#317 (claviska#318)

Signed-off-by: bnomei <[email protected]>

Merge branch 'bnomei-php8'

Merge branch 'bnomei-php8'

 Implicit conversion from float 50.800000000000004 to int loses preci…

…sion (claviska#310)