Merged in FAB-1165-paste-multiline-code (pull request #788)
fix(plugin): fix text transform when pasting to a code block
affects: ak-editor-plugin-block-type, ak-editor-prosemirror
fix(plugin): trying to get plain text from the serialised nodes
affects: ak-editor-plugin-block-type
fix(plugin): loop through the nodes and create a node out of slice
test(plugin): tests for paste transformer
fix(plugin): fix text transform when pasting to a code block
affects: ak-editor-plugin-block-type, ak-editor-prosemirror
fix(plugin): trying to get plain text from the serialised nodes
affects: ak-editor-plugin-block-type
fix(plugin): loop through the nodes and create a node out of slice
affects: ak-editor-plugin-block-type
test(plugin): tests for paste transformer
affects: ak-editor-plugin-block-type