Make it easier to `make` our examples

[hboon]

When we run make in our examples, we get:

$ make
# Needs a target, example: $ make EntryToken.canonicalized.xml
#
# Let's say you have a TokenScript "EntryToken.xml"
#- to validate and canonicalize, add 'canonicalized' in the filename
$ make EntryToken.canonicalized.xml
# - to sign, use tsml as file extension:
$ make EntryToken.tsml

They then have to figure out to type: make iDAI.canonicalized.xml.

Since our examples only have 1 TokenScript per directory, can we make it easier for users?

[hboon]

Assigning @colourful-land for ideas.

[jzaki]

[__] As a TS developer, I want to easily make TS examples, so that I can understand tokenscript with less friction.

[SmartLayer]

It's better to modify the Signing Tool (at this moment xmlsectool) to do the canonicalization and signing in one go. The same signing tool can be done to download the certificates from the https website if it is missing / not supplied.

[SmartLayer]

@James-Sangalli said that he can deal with 3) option at low priority (meaning in a few months, I believe)

[jzaki]

As a smart contract developer, I want to easily make a basic tokenscript with my existing smart contract, so that I can quickly see the benefits of AlphaWallet