buildozer dict_add/dict_set does not allow for / in values

[oliviernotteghem]

The current buildozer syntax for dict_add and dict_set will corrupt value if it contains a/ char.

Repro: $ buildozer 'dict_add d applicationid:@string/hello' //:foo

Result:

foo(
    name = "foo",
    d = {"applicationid": "@string//:/hello"},
)

Expected:

foo(
    name = "foo",
    d = {"applicationid": "@string/hello"},
)

[larsrc-google]

@vladmos