Make generic, removing dependency on node_runtime (#1)

* Extract error to file

* Update readme

* Extract Rpc to separate file

* Make Rpc generic over Runtime

* Editor config etc.

* rustfmt

* Remove node-runtime dependency, generic soup

* Move generic trait bounds to impl

* rustfmt

* Remove unused stuff

* Add test for balance transfer call

.rustfmt.toml

@@ -0,0 +1,67 @@
+max_width = 90 # changed
+hard_tabs = false
+tab_spaces = 4
+newline_style = "Auto"
+use_small_heuristics = "Default"
+indent_style = "Block"
+wrap_comments = false
+format_code_in_doc_comments = false
+comment_width = 80
+normalize_comments = true # changed
+normalize_doc_attributes = false
+license_template_path = "LICENSE_TEMPLATE" # changed
+format_strings = false
+format_macro_matchers = false
+format_macro_bodies = true
+empty_item_single_line = true
+struct_lit_single_line = true
+fn_single_line = false
+where_single_line = false
+imports_indent = "Block"
+imports_layout = "Vertical" # changed
+merge_imports = true # changed
+reorder_imports = true
+reorder_modules = true
+reorder_impl_items = false
+type_punctuation_density = "Wide"
+space_before_colon = false
+space_after_colon = true
+spaces_around_ranges = false
+binop_separator = "Front"
+remove_nested_parens = true
+combine_control_expr = false # changed
+overflow_delimited_expr = false
+struct_field_align_threshold = 0
+enum_discrim_align_threshold = 0
+match_arm_blocks = true
+force_multiline_blocks = true # changed
+fn_args_layout = "Tall"
+brace_style = "SameLineWhere"
+control_brace_style = "AlwaysSameLine"
+trailing_semicolon = false # changed
+trailing_comma = "Vertical"
+match_block_trailing_comma = false
+blank_lines_upper_bound = 1
+blank_lines_lower_bound = 0
+edition = "2018" # changed
+version = "One"
+merge_derives = true
+use_try_shorthand = true # changed
+use_field_init_shorthand = true # changed
+force_explicit_abi = true
+condense_wildcard_suffixes = false
+color = "Auto"
+unstable_features = true # changed
+disable_all_formatting = false
+skip_children = false
+hide_parse_errors = false
+error_on_line_overflow = false
+error_on_unformatted = false
+report_todo = "Always"
+report_fixme = "Always"
+ignore = []
+
+# Below are `rustfmt` internal settings
+#
+# emit_mode = "Files"
+# make_backup = false