Add support for FileReader

• Add FileReader support, many thanks to @DineshSolanki and @frnknglrt for issue request and implementation.

Example:

    val imageString = KVar("")
    Kweb(port = 8008) {
        doc.body.new {
            val input = fileInput()
            input.onFileSelect {
                input.retrieveFile {
                    imageString.value = it.base64Content
                }
            }
            img().setAttribute("src", imageString)
        }
    }

Shoebox uses Json instead of Strings

0.7.32

bump version

Protobuf can encode null values

0.7.31

ProtoBuf can encode null values

Yet another MapDB issue in Shoebox

0.7.30

minor shoebox screwup

Minor dependency screwup

0.7.29

another dependency screwup

Another reorg of MapDB support in Shoebox

0.7.28

another MapDB change

Correct minor API untidiness in Shoebox

0.7.27

correct minor API redundancy in Shoebox

Update Shoebox, now includes general Map support

0.7.26

update Shoebox

0.7.25

#30 - removed some code that was interfering with browser history

Update Shoebox, now includes MapDB support

0.7.24

bump version