UPDATE: split the webapp in a widget and the app itself

This splits the webapp in:

* IronCalc (the widget to be published on npmjs)
* The frontend for our "service"
* Adds "dummy code" for the backend using sqlite

xlsx/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ironcalc"
-version = "0.2.0"
+version = "0.3.0"
 authors = ["Nicolás Hatcher <nicolas@theuniverse.today>"]
 edition = "2021"
 homepage = "https://www.ironcalc.com"
@@ -20,7 +20,7 @@ thiserror = "1.0"
 # Uses `../base` when used locally, and uses
 # the inicated version from crates.io when published.
 # https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#multiple-locations
-ironcalc_base = { path = "../base", version = "0.2" }
+ironcalc_base = { path = "../base", version = "0.3" }
 itertools = "0.12"
 chrono = "0.4"
 bitcode = "0.6.0"