Document STweep formatter bug: empty line indentation removal breaks code folding

[Copilot]

STweep formatter strips indentation from empty lines within code blocks, causing Codesys IDE to misinterpret block boundaries and break code collapse functionality.

Changes

• Added bug report template at .github/ISSUE_TEMPLATE/sweep_bug_report.md following STweep's official format
• Documented repro case showing 6-line block incorrectly collapsing as 3-line block after formatting
• Included version info: STweep 4.2.1, Codesys 3.5.21.30

Issue Illustration

Before formatting (collapses correctly as single 6-line block):

// parent instruction
	// step 1
	// step 2
	// step 3
	
	// step 4
	// step 5
// end of parent instruction

After formatting (empty line loses tab, splits into 3-line block + orphaned lines):

// parent instruction
	// step 1
	// step 2
	// step 3

	// step 4
	// step 5
// end of parent instruction

Original prompt

Generate a bug report for the pluggin STweep, using their bug report template where you describe this behaviour:

Original code:

// parent instruction
	// step 1
	// step 2
	// step 3
	
	// step 4
	// step 5
// end of parent instruction

The expected result is that when you collapse that code, you get this:

// parent instruction [6 lines]
// end of parent instruction

After formatting, the plugin will remove the tabs/spaces in the empty lines, returning:

// parent instruction
	// step 1
	// step 2
	// step 3

	// step 4
	// step 5
// end of parent instruction

Causing that when you try to collapse the parent instruction in Codesys, you'll get:

// parent instruction [3 lines]

	// step 4
	// step 5
// end of parent instruction

As can be seen, the IDE infers that these are two different blocks of code, breaking the hierarchy.

IDE: Codesys 3.5.21.30
STweep for Codesys version 4.2.1

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