Fix parsing of blocks

[swoboda1337]

Fix issues with parsing blocks:

• Right now every line needs to have the same indent. However C++ code inside a lambda will have varying indents. Instead of checking for a fixed indent check that the indent is greater than or equal to the indent on the first line. End the block only when the indent decreases.
• The rest of the editor handles tabs except for the lambda/block part. Check for both tabs and spaces.
• Allow whitespace after the block indicator. If there is a trailing space its not treated as a block and gets parsed as yaml.

Not only does the current parsing look bad it also confuses people into thinking indents in lambdas are not allowed. I have seen people post huge lambdas in discord without a single indent.

Current HA addon, no whitespace after |-

Current HA addon, with whitespace after |-

Fixed