customtype: add ability to register any custom type (#27)* customtype: add ability to register any custom type* make customtype internal, add valast.RegisterType* make reflect.Array support custom type (#1)---------Co-authored-by: Joe Chen <jc@unknwon.io>

add support for `time.Time`; make valast.Ptr generic (#25)* add support for time.Time* refactor: replace Addr with generic Ptr method

internal/bypass: remove unused codeSigned-off-by: Stephen Gutekanst <stephen@hexops.com>

update dependencies```go get -u ./...go mod tidy```Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

qualify literal values to valast.Addr when required (#19)* add test demonstrating valast.Addr type qualification issue#15* qualify literal values to valast.Addr when requiredFixes#15Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

update to latest gofumpt (long line formatter improvements)mvdan/gofumpt#70Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

do not run tests in parallel (fix race condition)The old autogold v0.8.1 version is not safe for concurrent testexecution, and we can't yet upgrade here due to an import cycle(#bootstrapping) so run tests serially for now.Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

Major improvements in handling of pointer values* No longer emits illegal `&"foo"`, `&88`, etc. - now emits valid expressions for these.* Removed `ErrPointerToInterface`, now allowing pointers to interfaces.

Greatly improve formatting; relax Go version requirement;- [gofumpt](#4) is now used to format the output.- Greatly improved the readability of long struct values when using `String` functions.- Relaxed Go version requirement from 1.16 to 1.15.- Other minor typo fixes, docs changes, etc.Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

README: correct expected outputSigned-off-by: Stephen Gutekanst <stephen@hexops.com>