add an explicit way to define the shape of drawn text

[anytarseir67]

the current text scaling system makes it needlessly difficult to define the "shape" of a character.

i feel that something more explicit than the current rusttype::Scale based system may be beneficial to the usability of this library .
one possibility is taking four numeric arguments, (x, y, width, height). where x and y define the position of the top left corner of the character, and width and height define how far the character extends from x and y

[anytarseir67]

for clarity:

as far as i can tell my issue with the current system actually stems from within the lib itself, as it seems to use the scale as the upper limits for the character, rather then using it as a set width and height.

[RouHim]

I would like to question the usage of rusttype in general, as it has been inactive (last release was 3 years ago) and unmaintained.