v0.49.0

Most relevant commits:

• cmd/scriggo: support '//go:build' in generated package files
• cmd/scriggo: make generated packages file as fmt want
• native: improve 'CombinedPackage.LookupFunc' method documentation
• scriggo: remove outdated comment on 'BuildOptions.Packages'
• compiler/checker: rearrange code for checking method expressions
• compiler/checker: revise type checking of method values
• compiler/checker: fix error using a package identifier without selector
• compiler/checker: fix access to unexported method values of interfaces
• compiler/checker: fix access to unexported method expr. of interfaces
• compiler/emitter: fix 'delete' when map type is a Scriggo type
• runtime,scriggo: don't panic if an out error occurs running a template
• scriggo,scripts: improve documentation of 'Run' method on panic
• scriggo,scripts: remove 'MustRun' methods
• script: document '*ExitError' error is returned calling 'exit' built-in
• compiler: implement 'import for' declaration
• compiler/emitter: fix invalid behavior with short variable declarations
• runtime: fix show of a 'markdown' value to HTML context
• compiler/emitter: fix emission of optimized show macro calls
• scriggo/cmd: make 'version' subcommand prints Scriggo and Go versions
• compiler: re-implement extends adding an import and swapping files
• scriggo/cmd: add 'init' and remove 'build' and 'install' subcommands
• cmd/scriggo: rename 'scriggo embed' subcommand to 'scriggo import'
• native: rename 'Package', 'PackageImporter', 'DeclarationsPackage' types