Allow optional arguments for Ditaa

[Skovisen]

According to the plantUML documentation regarding inline Ditaa you should be able to specify optional arguments, either as

Option 1:

@startditaa arguments-given-here
...
@endditaa

or as

Option 2:

@startuml
ditaa(arguments-given-here)
...
@enduml

Expected Behavior

The following code with Option 1:

@startditaa  --no-separation
+-------+
|+------++
||+------++
|||       |
++|       |
 ++       |
  +-------+
@endditaa

or Option 2:

@startuml
ditaa(--no-separation)
+-------+
|+------++
||+------++
|||       |
++|       |
 ++       |
  +-------+
@enduml

should both give

Current behavior

Option 1 gives:

Option 2 gives:

According to the developer tools, there seems to be a bad request towards some plantuml server whenever option 2 is used. Note that it seems that option 2 doesn't work at all, not even without options.

Steps to reproduce

1. Open a new Markdown note
2. Copy-paste code given above into editor
3. Observe how it renders

Environment

• Version : Boostnote 0.11.13
• OS Version and name : Windows 10 Pro

[Flexo013]

Bumping this as it would be a nice feature.