fix: improves macro param default value handling

[pedrolamas]

Improves the regular expression used to detect macro parameter defaults. This should be a bit more permissive with white-space and multiple params on the Jinja2 default function.

Tested with the following example:

[gcode_macro TEST]
gcode:
  {% set A = params.A | default(0, true) | float %}
  {% set B = params.B | int | default(0.005, true) | float %}
  {% set C = params.C | default("PLA", true) %}
  {% set D = params.D | default("PLA") %}
  {% set E = params.E | int | default(0.2) %}

The above example macro will show like this:

Fixes #376

Signed-off-by: Pedro Lamas [email protected]

[matmen]

LGTM