Improve 'show_build_options' target

[drashna]

• Align the output to maximize readibility
• Add Bootloader to listed output

Types of Changes

• Core
• Enhancement/optimization

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[drashna]

I'd like to get the rest formatted too, but that's ... make, and I'm not up for that, right now.

[mtei]

for example:

diff --git a/show_options.mk b/show_options.mk
index cd04f6a0d..1520ac15c 100644
--- a/show_options.mk
+++ b/show_options.mk
@@ -86,7 +86,7 @@ OTHER_OPTION_NAMES = \
   LTO_ENABLE
 
 define NAME_ECHO
-       @echo "  $1 = $($1)             # $(origin $1)"
+       @printf "  %-30s = %-16s # %s\\n" "$1" "$($1)" "$(origin $1)"
 
 endef